GOODWILL AND OTHER INTANGIBLE ASSETS - Other Intangible Assets Subject to Amortization (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Other intangible assets:
Weighted average life (in years)	9 years 1 month 6 days
Total other intangible assets, cost	$ 2,659	$ 3,443
Amortizable intangible assets, accumulated amortization	862	804
Total other intangible assets, net	1,797	2,639
Certificates of need
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	1,138	1,771
Medicare licenses
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 292	522
Customer contracts/ relationships
Other intangible assets:
Weighted average life (in years)	9 years 4 months 24 days
Amortizable intangible assets, cost	$ 929	883
Amortizable intangible assets, accumulated amortization	659	620
Amortizable intangible assets, net	$ 270	263
Trade names and technology
Other intangible assets:
Weighted average life (in years)	6 years 8 months 12 days
Amortizable intangible assets, cost	$ 142	160
Amortizable intangible assets, accumulated amortization	104	97
Amortizable intangible assets, net	$ 38	63
Provider contracts
Other intangible assets:
Weighted average life (in years)	11 years 7 months 6 days
Amortizable intangible assets, cost	$ 73	72
Amortizable intangible assets, accumulated amortization	61	57
Amortizable intangible assets, net	$ 12	15
Noncompetes and other
Other intangible assets:
Weighted average life (in years)	8 years 4 months 24 days
Amortizable intangible assets, cost	$ 85	35
Amortizable intangible assets, accumulated amortization	38	30
Amortizable intangible assets, net	$ 47	$ 5